Proximity sensor, particularly distance sensor and oscillatory high-frequency proximity sensor, has inductor-capacitor resonator, which has detecting coil and resonance capacitor, where resonance capacitor is switched over detection coil

摘要

The proximity sensor has an inductor-capacitor resonator (10), which has a detecting coil and a resonance capacitor. The detecting coil is provided for detecting the object, and a resonance capacitor is switched over the detection coil. A time counter (51) is configured to determine the length of the period of a positive voltage.